Grantham, Mayo, Van Otterloo & Co (GMO)
ALT icon

Grantham, Mayo, Van Otterloo & Co (GMO)’s Altimmune ALT Stock Holding History

Grantham, Mayo, Van Otterloo & Co (GMO)’s Portfolio ALT Stock Details ALT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q3 		$102K Sell
35,659
-48,178
-57% -$148K ﹤0.01% 676
2026
Q2 		$255K Sell
83,837
-42,552
-34% -$127K ﹤0.01% 619
2026
Q1 		$389K Sell
126,389
-46,170
-27% -$196K ﹤0.01% 568
2025
Q4 		$623K Buy
+172,559
New +$752K ﹤0.01% 562

Other funds holding ALT

BlackRock
BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.21T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM
Marshall Wace
Marshall Wace London, United Kingdom $114B AUM 35.47% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Nuveen
Nuveen Charlotte, North Carolina $420B AUM 34.97% 1-Year Est. Return
Nantahala Capital Management
Nantahala Capital Management New Canaan, Connecticut $3.16B AUM 31.44% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return
Vanguard Fiduciary Trust
Vanguard Fiduciary Trust Malvern, Pennsylvania $463B AUM

Grantham, Mayo, Van Otterloo & Co (GMO)'s ALT Position: Q3 2026 in Review

Grantham, Mayo, Van Otterloo & Co (GMO) reduced its Altimmune (ALT) stake by 57% in Q3 2026, selling an estimated $148K and leaving 35,659 shares worth $102K. The position accounts for ﹤0.01% of the portfolio, ranked #676.

Grantham, Mayo, Van Otterloo & Co (GMO) first reported a position in ALT in Q4 2025 and has held it in 4 quarters since. The position peaked at $623K in Q4 2025. 130 funds tracked by Wall St. Rank hold ALT as of Q3 2026.

  • Grantham, Mayo, Van Otterloo & Co (GMO) held 35,659 shares of Altimmune worth $102K as of Q3 2026.
  • Grantham, Mayo, Van Otterloo & Co (GMO) sold 48,178 Altimmune shares in Q3 2026, an estimated $148K.
  • Altimmune made up ﹤0.01% of Grantham, Mayo, Van Otterloo & Co (GMO)'s portfolio in Q3 2026, its #676 holding.
  • Grantham, Mayo, Van Otterloo & Co (GMO) first reported a position in Altimmune in Q4 2025 and has held it in 4 quarters since.
  • Grantham, Mayo, Van Otterloo & Co (GMO)'s Altimmune position peaked at $623K in Q4 2025.
  • 130 funds tracked by Wall St. Rank held Altimmune as of Q3 2026.

Based on Grantham, Mayo, Van Otterloo & Co (GMO)'s 13F filing for Q3 2026, filed 13 Nov 2026.